The AirTAC Airtac 3V Solenoid Valves 3V206NOAIT is a genuine 3-port 2-position (3/2) solenoid valve with 1/8 in ports. It either feeds its outlet or vents it to exhaust, which is what makes it the valve for single-acting cylinders, on/off air blow, clamping, vacuum switching and pilot duty.
The AirTAC 3V206NOAIT is a normally open 3/2-way solenoid valve in the NPT-threaded 1/8in-port build: it passes air from supply to outlet while de-energised and vents the outlet the moment the AC220V coil switches. Power the coil and the line dumps; cut power and the spring returns the flow. That inverted logic suits safety-vent circuits, fail-open blow lines and any duty where air must keep flowing through a blackout or an emergency stop. Inside sits a direct-acting coaxial poppet with spring return, so the valve needs no minimum pressure differential to shift and is rated down to full vacuum, -102.2 kPa to 0.1 MPa. Flow through the 1/8in port is 3.2 mm2 effective area, Cv 0.18, and the coil draws 7 VA on AC220V. The I suffix in the code means the electrical entry is a flying-lead connection - a pre-wired lead-out of roughly 0.5 m - instead of a DIN plug socket, which keeps the terminal box off cramped panels. Enclosure protection is IP65 (DIN 40050).
| Model | Airtac 3V Solenoid Valves 3V206NOAIT |
|---|---|
| Series | 3V2 |
| Valve type | 3/2-way (3-port, 2-position) |
| Function | Direct-acting, single solenoid, spring return |
| Initial state | Normally open |
| Port size | 1/8 in |
| Thread | NPT |
| Coil voltage | AC220V |
|---|---|
| Electrical entry | Flying lead (lead-out wire type) |
| Coil power | 7 VA |
| Operating pressure | 0-0.8 MPa (0-114 psi) |
| Vacuum service | Rated -102.2 kPa to 0.1 MPa |
| Flow coefficient | Cv 0.18 (3.2 mm2 effective area) |
| Temperature | -20 to 70 C |
| Construction | Coaxial shut-off (poppet), direct-acting, spring return |
| Protection | IP65 (DIN 40050) |
| Medium | Air, filtered by a 40 µm or finer element. Lubrication not required. |
Figures follow the official AirTAC 3V2 catalogue. Confirm coil voltage and thread (PT / NPT / G) against the product label before wiring.
| 3V2 | Body — sets the flow, the coil power and whether vacuum is rated. |
|---|---|
| 1/8 in | Port size. M5, 06 = 1/8 in, 08 = 1/4 in, 10 = 3/8 in. |
| NO | Normally open: air passes until the coil is energised. |
| AC220V | Coil voltage. A = AC220V, B = DC24V, C = AC110V, E = AC24V, F = DC12V. |
| I | Electrical entry: I = flying lead, otherwise a DIN plug. |
| NPT | Port thread. PT ships from stock; G and NPT are available to order. |
A 3/2 valve has three ports — supply, outlet and exhaust — and two states. It either feeds the outlet or vents it to exhaust, and that is the whole job.
That makes it the right valve for a single-acting (spring-return) cylinder, on/off air blow, a clamp, switching a vacuum generator or suction cup, and piloting a larger valve.
It cannot run a double-acting cylinder. A double-acting cylinder needs air alternately on two sides, which takes a 5-port valve — the AirTAC 4V series.
A benchtop testing rig pulls vacuum to clamp flat specimens; the normally open valve holds the vacuum path through the idle state and breaks it under coil power when the operator releases the part, exploiting the -102.2 kPa rating.
When controls lose power, the NO valve keeps blowing filtered air across solvent vapour in the mixing cabinet; only an energised coil stops the purge, so a tripped breaker leaves the ventilation on.
A single-acting clamping cylinder on a jig holds the workpiece by spring force; the valve in its normally open state feeds the clamp continuously and vents the cylinder on signal to free the part.
Pick this SKU when three things line up: the circuit should be open (passing) at rest, the machine uses NPT 1/8in pipework, and you want the valve wired by a lead-out rather than a plug. If your panel is built on British parallel threads, the G/BSPP variant is a catalogue option to order instead - NPT here is a specification of this code, not a stock promise. Confirm the exact lead length and connector detail from the datasheet before committing. Sizing both ways: step down to 3V1 if the duty is tiny and coil power dominates (3.0 W on DC24V there versus 7.0 W here), or to 3V2M where a dense multi-station manifold matters more than flow, at the cost of Cv 0.1 because the base routes the air. Step up to 3V3 (1/4in, Cv 0.62, also vacuum-rated) when you need roughly three times the flow. Note the 1/8in to 1/4in step inside 3V2 lifts Cv only from 0.18 to 0.19, so a bigger 3V2 port is rarely worth it. Any double-acting cylinder needs a 5-port valve - go to the AirTAC 4V series for that.
Confirm before you order
It is a 3/2-way, direct-acting, single-solenoid, spring-return valve with a coaxial poppet. Effective area and Cv per port: 3V206 (1/8in) = 3.2 mm2 / Cv 0.18; 3V208 (1/4in) = 3.4 mm2 / Cv 0.19 - this code uses the 1/8in figures. Operating pressure is 0-0.8 MPa (0-114 psi), and the valve is also rated for negative-pressure service from -102.2 kPa to 0.1 MPa. Working temperature spans -20 to 70 C. Coil power is 7 VA on AC and 7.0 W on DC; this AC220V version therefore draws 7 VA. Protection is IP65 (DIN 40050). The medium is air filtered to 40 um or finer, with no lubrication required, and a manual override is fitted for commissioning.
Normally open means supply-to-outlet flows while the coil is off; energising the AC220V coil shifts the poppet and vents the outlet, and the spring restores flow on power loss. It feeds or vents one line, so it drives single-acting spring-return cylinders, on/off air blow, clamping fixtures, vacuum switching and pilot duty on a larger valve. It cannot by itself position a double-acting cylinder - that needs two outlet states and a 5-port valve such as the AirTAC 4V series.
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